April 2015 - kernelnewbies@kernelnewbies.org - Kernelnewbies Mailing Lists

packet_mmap: How to kernel address from user-space address
by selvamuthukumar v April 6, 2015

April 6, 2015

I'm trying to accelerate snort with a hardware Pattern Matching Engine. snort gets packets using libpcap which uses packet mmap. snort gets the mmap-ed address, it does all header parsing, now I want to offload the content detection to hardware. PME driver currently provides and ioctl interface to pass the packet. Driver does copy_from_user to get packet data to kernel and try to match it against pre-loaded contents. I'm trying to avoid this copy. What is the best way to get the kernel address from user address in this case?

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/sys/module/ info for pci driver
by rahul b April 6, 2015

April 6, 2015

Hi After loading pci driver for proprietary ethernet card, i dont see the few module detail in in /sys/module/<module-name>/drivers/pci:<module-name>/net . Can someone tell what APIs should be used to get the ethernet interface name , mac address details . Thanks

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Re: "Hurr durr I'ma sheep"
by Kaushal Shriyan April 6, 2015

April 6, 2015

Thanks Alan for the reply. Regards, Kaushal On Mon, Apr 6, 2015 at 1:01 PM, Alan Braithwaite <asbraithwaite(a)gmail.com> wrote: > Linus put up a poll for the 4.0 code name on google+ > > https://plus.google.com/+LinusTorvalds/posts/TvigQqA9m3w > > That was the result. > > - Alan > > On Mon, Apr 6, 2015 at 12:08 AM, Kaushal Shriyan <kaushalshriyan(a)gmail.com > > wrote: > >> Hi, >> >> what does "Hurr durr I'ma sheep" mean in context to kernel version Linux >> 4.0? >> >> Regards, >> >> Kaushal >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies(a)kernelnewbies.org >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> >> >

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"Hurr durr I'ma sheep"
by Kaushal Shriyan April 6, 2015

April 6, 2015

Hi, what does "Hurr durr I'ma sheep" mean in context to kernel version Linux 4.0? Regards, Kaushal

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Re: Help learning from my mistakes
by Nicholas Krause April 5, 2015

April 5, 2015

On April 4, 2015 6:53:52 PM EDT, Valdis.Kletnieks(a)vt.edu wrote: >On Sat, 04 Apr 2015 15:28:23 -0400, Nicholas Krause said: > >> After reading this it seems that the issue is my lack of effort not >my abilities. > >Being able to realize that the find|xargs grep solution was actually >less work, with quicker results, is *itself* an ability. I agree my strength is not in finding the most effective way to debug or find an answer to a question. I will slowly start working on it. In the meantime I am having issues with the rc 6 candidate after enabling debugging for locks as my builds for kernels are now slower by up to 3 times, I am assuming this is normal however please know if otherwise. Thanks, Nick -- Sent from my Android device with K-9 Mail. Please excuse my brevity.

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Reading kernel code
by Nicholas Krause April 5, 2015

April 5, 2015

Greetings All, I am interested someone testing me to make sure I understand the memory management and networking subsystems. I am pretty certain I'm not grasping certain details fully. Thanks Alot, Nick -- Sent from my Android device with K-9 Mail. Please excuse my brevity.

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Help learning from my mistakes
by Nicholas Krause April 4, 2015

April 4, 2015

Greetings All, I am wondering if there are any stupid mistakes in my attempts at kernel programming I am still making. Thanks, Nick -- Sent from my Android device with K-9 Mail. Please excuse my brevity.

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PCIE Switch Bringup Problem
by Ashish Khetan April 3, 2015

April 3, 2015

Hi, I am using MPC8640D based powerpc board. I am trying to bringup PCIe switch(PES64H16AG2) using linux BSP(Linux-3.14). After Power on reset its unable detect to detect any link on PCIe BUS. While on another bus PCIe link is detected which is not another PCIe device. Any debugging points/link will be really helpful. Regards @$HI$H

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How can I make a multi-page size block request in kernel?
by Hyukjoong Kim April 3, 2015

April 3, 2015

Hi, I'm trying to make a special block request at the scsi high-level device driver (scsi_lib.c). My target device is SATA block storage, and SATA block stroage typically use scsi_lib.c as a high-level device driver. This block request is simple write request similar to typical block request from file system, but doesn't pass through VFS and file system layer. >From the linux kernel source, I found two keywords to solve this problem, 1) REQ_TYPE_BLOCK_PC, and 2) blk_make_request() So, I make a request like this procedure, bio malloc -> map data into bio using bio_add_pc_page (more than 2 pages) -> get request structure using blk_make_request(q, bio, GFP_KERNEL) -> setup request->cmd similar to sd_setup_read_write_cmnd() on sd.c (driver/scsi) But am I right? because I got some error on the SATA like this, ata4.00: exception Emask 0x70 SAct 0x1e0 SErr 0x400900 action 0x6 frozen ata4.00: irq_stat 0x28000000, host bus error, interface fatal error ata4: SError: UnrecovData HostInt Handshk ata4.00: failed command: WRITE FPDMA QUEUED ata4.00: cmd61/10:28:00:00:c0/00:00:0d:00:00/40 tag 5 ncq 8192 out res 40/00:30:00:00:bf/00:00:0d:00:00/40 Emask 0x70 (host bus error) ata4.00: status: {DRDY} ... Anyone who has knowledge for make block request inside device driver? or, solution for the error message? Thnks, -Hyukoong, Kim 김 혁 중 성균관대학교 IT 융합학과 박사과정 임베디드 소프트웨어 연구실 Kim, Hyukjoong Sungkyunkwan University Ph.D Course in Computer Engineering, IT Convergence Embedded Software Lab. e-mail : wangmir(a)skku.edu / wangmir(a)gmail.com phone : +82 10-9489-8974

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https://lkml.org/lkml/2014/11/13/785
by Hemanth Kumar April 2, 2015

April 2, 2015

Hi All/greg, What is the reason this particular patch is still not yet merged https://lkml.org/lkml/2014/11/13/785 This is straight patch which fixes this issue for arm64 bit. Regards, Hemanth

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